Improvement in spark-arresters for locomotives



D. HAWKSWORTH. Spark-Arrester for Locomotives.

Patented Nov. 11,1879.

/QJZZEZEW I WITNESSES: a W! ATTORNEYS.

UNITED STATES PATENT QFF'IOE.

DAVID HAWKSWORTH, OF PLATTSMOUTH, NEBRASKA.

IMPROVEMENT IN SPARK-ARRESTERS FOR LOCOMOTIVES.

Specification forming part of Letters-Patent N0. 221,553, dated November 11, 1879 application filed August 23, 1879.

sides of the stack. This is combined with astack having an annular chamber that receives the sparks, from which chamber they are drawn by suction obtained by the use of an interior conical pipe or nozzle, the sparks and cinders being thus circulated and broken up until they pass ofi in dust. These features will be more particularly explained with reference to the accompanying drawings, wherein Figure 1 is a vertical section of alocomotive smoke-stack embodying my invention. Fig. 2 is a sectional plan view on line a; :10.

Similar letters of reference indicate corresponding parts. I

The stack consists of the base 0, straight pipe D, and flaring top E, in which is fitted the screen or netting B. In the bottom of the stack, attached by rivets or bolts r, is the conical or tapering pipe or nozzle T, the smaller end of which is upward and terminates at the lower end of the straight pipe P. The pipeP is attached within D, and is held concentric by the thimbles and bolts to, so that there is an annular space between D and P, and the pipe P extends a short distance within the flaring top E of the stack. The space between the lower end of P and the upper end of the tapering nozzle T is sufficiently large to allow cinders to pass.

The spark-arrester is fitted in the flaring top of the stack above the pipe P. This consists of an inverted cup or dish, A, held in place by the bolts R, that are attached to the sides of the flaring top E, and having attached within it the curved annulus a, which is held in place by the bolts 1) and thimbles c. The cup A is formed with a nipple, f, in the center of its under side, which is above the center of pipe D, and the under side of A curves from the point of f outward. The outer edge of the annulus a curves downward, and its openingisconcentric with the thimble f.

I n operation, the cinders and sparks thrown upward through pipe 1? by the locomotive-exhaust strike the spark-arrester in the top of stack, and are either deflected directly against the sides E of the stack or are caught by the annulus a. In either case the cinders fall through the space between ,D' andP until they reach the opening at the bottom of P, where, by the suction of the exhaust through the nozzle T, the cinders, 850., are drawn upward through pipe P and thrown again in contact with the arrester. The cinders and sparks are thus kept in continuous circulation until they are broken up so fine that there is not substance enough to hold fire, and they pass oft through the netting in the form of dust.

Having thus described myinvention, Iclaim as new and desire to secure by Letters Patent 1. The combination, with a stack, B O D E, and arrester A, of the straighttube P and tapering nozzle T, arranged as shown and described.

2. In combination with alocomotive smokestack, the spark-arrester consisting of the inverted cup or cone A and curved annulus a, supported by the bolts R, substantially as and for the purposes set forth.

DAVID HAWKSWORTH.

Witnesses SERENO DUTTON, ALEXANDER SOHLEGEL. 

